Python/strings/barcode_validator.py at yash · Yashcodes04/Python · GitHub

Name: Python/strings/barcode_validator.py at yash · Yashcodes04/Python · GitHub
Rating: 4.5 (1098 reviews)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
"""
https://en.wikipedia.org/wiki/Check_digit#Algorithms
"""


defget_check_digit(barcode: int) ->int:
"""
 Returns the last digit of barcode by excluding the last digit first
 and then computing to reach the actual last digit from the remaining
 12 digits.

 >>> get_check_digit(8718452538119)
 9
 >>> get_check_digit(87184523)
 5
 >>> get_check_digit(87193425381086)
 9
 >>> [get_check_digit(x) for x in range(0, 100, 10)]
 [0, 7, 4, 1, 8, 5, 2, 9, 6, 3]
 """
barcode//=10# exclude the last digit
checker=False
s=0

# extract and check each digit
whilebarcode!=0:
mult=1ifcheckerelse3
s+=mult* (barcode%10)
barcode//=10
checker=notchecker

return (10- (s%10)) %10


defis_valid(barcode: int) ->bool:
"""
 Checks for length of barcode and last-digit
 Returns boolean value of validity of barcode

 >>> is_valid(8718452538119)
 True
 >>> is_valid(87184525)
 False
 >>> is_valid(87193425381089)
 False
 >>> is_valid(0)
 False
 >>> is_valid(dwefgiweuf)
 Traceback (most recent call last):
 ...
 NameError: name 'dwefgiweuf' is not defined
 """
returnlen(str(barcode)) ==13andget_check_digit(barcode) ==barcode%10


defget_barcode(barcode: str) ->int:
"""
 Returns the barcode as an integer

 >>> get_barcode("8718452538119")
 8718452538119
 >>> get_barcode("dwefgiweuf")
 Traceback (most recent call last):
 ...
 ValueError: Barcode 'dwefgiweuf' has alphabetic characters.
 """
ifstr(barcode).isalpha():
msg=f"Barcode '{barcode}' has alphabetic characters."
raiseValueError(msg)
elifint(barcode) <0:
raiseValueError("The entered barcode has a negative value. Try again.")
else:
returnint(barcode)


if__name__=="__main__":
importdoctest

doctest.testmod()
"""
 Enter a barcode.

 """
barcode=get_barcode(input("Barcode: ").strip())

ifis_valid(barcode):
print(f"'{barcode}' is a valid barcode.")
else:
print(f"'{barcode}' is NOT a valid barcode.")